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A familiar dog looks up at you. Could that everyday moment involve a hormone?

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Researchers have studied oxytocin as one part of human–dog bonding.

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A 2015 study linked dogs’ gazing behavior with changes in their owners’ urinary oxytocin.

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An additional experiment tested oxytocin in dogs, not a bonding treatment in people.

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Urine measurements and a particular interaction cannot capture the whole biology of trust.

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Effects also depend on context, and one hormone does not explain a relationship.

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Medical oxytocin has specific obstetric uses, including selected labor care and postpartum bleeding.

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Those indications do not establish a treatment for loneliness or stronger bonds.